Revealing the oxidation mechanism of ferritic heat resistant steel in high-temperature flue gas

被引：7

作者：

Li, Xiaogang ^{[1
,2
]}

Li, Kejian ^{[1
,2
]}

Li, Shanlin ^{[1
,2
]}

Cai, Zhipeng ^{[1
,2
,3
,4
]}

Pan, Jiluan ^{[1
,2
]}

机构：

[1] Tsinghua Univ, Dept Mech Engn, Beijing 100084, Peoples R China

[2] Minist Educ, Key Lab Adv Mat Proc Technol, Beijing 100084, Peoples R China

[3] Tsinghua Univ, State Key Lab Tribol, Beijing 100084, Peoples R China

[4] Tsinghua Univ, Collaborat Innovat Ctr Adv Nucl Energy Technol, Beijing 100084, Peoples R China

来源：

CORROSION SCIENCE | 2022年 / 205卷

基金：

中国国家自然科学基金;

关键词：

A; Steel; B; TEM; EPMA; C; Oxidation; Sulphidation; REAL-TIME OBSERVATION; BI EUTECTIC ALLOY; CORROSION BEHAVIOR; MARTENSITIC STEEL; POWER-PLANTS; INTERNAL OXIDATION; FE-9CR-1MO STEEL; CR; IRON; SULFIDATION;

D O I：

10.1016/j.corsci.2022.110441

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Oxidation behaviors of ferritic heat resistant steel T91 exposed to high-temperature flue gas for long term have been investigated in this study. Oxidation mechanism in high-temperature S-containing environment was newly understood and a novel metallurgical model was proposed. It suggested that sulphidation always preceded oxidation by forming CrS/Cr7S8 particles in the front of the internal oxide layer, accompanied by M23C6 dissolution and local matrix recrystallization. CrS/Cr7S8 nucleated around the MX phases at grain boundaries of recrystallized ferrite by diffusion. Sulfur-assisted microstructural evolution fundamentally affected the subsequent internal oxidation, controlling the oxidation mechanism.

引用

页数：14

共 57 条

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